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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64a3a6bfeca9fde06ba44f00cb43f03f0a273dc404abe6b683794fbf9d47e629' 
  AND token = 'zRG3bMQUC5Qc0xNpblvXL+O0P26C1XsaDfYSUsWVdgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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