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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4296b56ce448854858752113f9c5ab45d2ae60763a874d7d09e672995bb185bd' 
  AND token = 'U1s2N9N4izOJWImEnAxyCQ+kyeA/waKsqpMlZnba63k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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