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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17fdeff426dfaa4567bda5ef8c26d0093007616c921d94ff0dad987e47e0d98d' 
  AND token = '0yFOCvxSRFtxsFf3tH0e2lJYAAsPloN5HIe/dzxITUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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