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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd493fb445d21a94c3095aacb44c297a0324ce9c23c01287aeb4e52dbfcec3e92' 
  AND token = '6TtunegCiQOT+kkKn4IAClSgJT6sOkKFSBFacV17sz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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