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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7f9c9e95fd9037aa19fe7667aa05369872b78c4af9d1c50ee26254abfd1b5ba' 
  AND token = 'yUVQHd8IH1PsBhypgO7caByPYhX1ZF6zJ4oTsI8HKx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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