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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ecc89b62567e8efc0e3027d9cb4c91ba3c7c99ea0a7a27ef5f0d81b61d8039' 
  AND token = 'LGzKE72bu+ll7rh5qB/NKcGtKANla0ktwlr78YmRchA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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