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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12cab2333241af1dce04de083ca1a45dd4cf24d75c387dcf9d1e95e35000cb56' 
  AND token = 'a+bPDvKg0ZGG3WRscM/ZZA0oBXR1fbcdLKTdh7oku+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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