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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba01cee37ca2c83d57333a6253731cd1d7f01c002cef0ef3b334c2076bc171c4' 
  AND token = 'dlUD9jcXOHa1rELzusEGUtFRCHSJp9IZcrTxwtuepnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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