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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84cdc4de4894cf78e91089998b905e1a3a339026bd3ad79449a72995347d69e3' 
  AND token = 'EA3ji8/aln93P9kGT28G3ghXP3Gxc6gUP/2JxUjN09Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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