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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ffb29958b9014a5290c1bdddce94f8b21696ef195c4d6b5862d42aa156916d' 
  AND token = 'eBKOCCL8tR0h5OYc356FwivNNJE2yNUIy7qQsYg/Mbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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