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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad648ab49715049b9c149b0100b534f23548445b6b341dcc1f69bf11a6d93172' 
  AND token = 'vIwTNWVklROxBzh5QBGC9ei75dD+shOJ07lV1Q7tSL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00108

JSON explain

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