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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f76710d1be201e04a63f01a9ce75cffc211cc4b38893ce5b2169d47e3ba586c1' 
  AND token = 'snovznP1nJ5o/afXMQlDtQK//X9ZR6SkYS6BRRlOm0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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