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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0ef0dbac1b6a6732d0cde27ed3d3fa8af5a7f64e8e3e1988cd4d7ce758a0d64' 
  AND token = '1BtZ3CYzWNkGbnXvR75+YqKxRVVGdof9Wp887N1s33g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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