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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f109034cfc3dc64b6a29a72770f73f28e203bc602c56e2bab71f12d07cd44b09' 
  AND token = 'ojKx8l5sIWgRfnXzHJQy4C4p8m4aYgeYoIag1j/oQpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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