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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7740b71557125e24a77d6c0c60c79cb1df99fe56dd3f89d38a368e9b001beb2c' 
  AND token = 'aL2MOsCLCR7aiEX6J1H6o/JTs1whKTSucrHuwqf4JdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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