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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba2db6bbdd4bc0f840ba634ad017a762e51eac374377365d8c9fae0775e2df8' 
  AND token = 'i4hUHcArJotcVGVzkc7wLo+V8pNHZpoofQ/nwXKTbvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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