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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ebc31c1a3b7c209f93b650a973352d43718c255f7d65a0c36d98124aed0b4c5' 
  AND token = '1wDyeGQswdXD5tkRqg1Ce+lyv3Ar+RWiv1fLSygHppQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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