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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a6f217066e4b003bfcc4c3a78ae1d8686053507a71ae742b4c31eec24b4a701' 
  AND token = '0968B4Y3IxfoN8CHxDmMOmf96/8bBIJkPelrHp7odUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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