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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd65e1e1817f2045b788ebe4666d90654c4797db08bc1e130f0a30b50434167' 
  AND token = 'yk0Y8wqTZob184Mv+i4o//0LQA2Mti3zJuGLpfxRXyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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