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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0093e495116b344e52d39c79a408cfcdb62507541dfa4178935241c72c71c35b' 
  AND token = 'NandkNsHuSewH7H+SbIUOnx4/TZeYloyxtdjuYZ2h54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}