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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc3d528c6214241488dd6466e11516df4f2ba100b6c4caf50bcb7694ab4cf64' 
  AND token = '2Gqo5jrerdC2grsR9cvPiP4gf/iIbMVAocfOCN5iVFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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