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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd341213fe85d117e997a1227b19278302b73457fded7edd6af0a1b2b7ae593dc' 
  AND token = 'vt0N1zkFqAyEk7W8s5AhbZjOciaE5tuEI4SB9Ir4fo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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