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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f45fba78777219ec9133e53a625791899bdecc7879d0757e688d4600c0f0e70' 
  AND token = 'nZXew707nd2cSD1mFDVxFemV9SQyUflnwW+vUSL4sNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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