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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b8972c6cba0a7850b57480bfbe1afbfc216d78f0a0de4d86d9dbc536804eefa' 
  AND token = 'Q6vdLevhGvpxRX+WwG+v34Nvd6gZqE+N46xv6rAR39E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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