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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a13ff96abac0a63688eb9cf0de70acbc0a1a36f7c05b4db7ce69da7faed6f57d' 
  AND token = 'c7dpbJ749UAiWLI+epqwq/frywYViQ6Uwik6txuFmpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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