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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ab177101fda7992e3c13cf127d3edae0a42273c603f393b4ae6a687ddb1438' 
  AND token = 'utxEb8WgRjGsOJnbdnEk1F05x9oXU3FK1EUJUTpj/Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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