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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaad979a444c2fb1549ba1f2a886c614cd6b36a17c27e7d0f11238bc912428d9' 
  AND token = 'z0cyldoLIImu3NmeY2K2cOo/pys8gvIf3jMTwhmbv1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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