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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afe61bfc8656b7691a5c5b3ba72b5d4942519a137b5754e88f8f20fd9e23518e' 
  AND token = 'KzAqc0+Lj442PYGkUw1ewtTKUYI772bEInQtG1d+6/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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