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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c46736c4fc9f4e7fc858953fc572f196339244179ff9251b627033074bcee9' 
  AND token = 'OZgX7ZojBiMjaz8JA1iuY2CA7ll/zbE5DVBV3cpM384=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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