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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba18a572db8680bc57968fe29b93071c76d7b3650f0fc816c9d1a0d2d9db9a1b' 
  AND token = 'rvJqTrDWzAiGwJSkowDWZzRkYDbaWzManB/md+ROMO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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