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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89164d646323619b5419d7534ee16691d176701827ca17e0c8a49f1e5ae461c8' 
  AND token = '1wKkULQjz3DqgxXubUj6uDkgJL8BQ25WpRKHWqidMTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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