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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3711dad569f139447e9ed6730f0c094ee8a817cb1b1c8a83c7aa628de6741f92' 
  AND token = '46XJxmW4Jxs+ztspfdqqHdpRRn3r9mcl97sH392EbHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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