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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b50096a9ac041f953cd3eecabc799e3678de1f60b6fd003f394b068bdc1519d7' 
  AND token = 'G5dTGi72CBeptNvxVGz20Ss6Y0ZAk2bCgDy1wKJ+za0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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