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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47207153051bd2388d6044297d986ff23e9fef4e4861d0d5a689985838d3665f' 
  AND token = 'fJoSQuRAwMsN4XdMEGhOT+TQK09BKiBoJukW7dXnRCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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