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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee5e3dcf17e30ee421be57945b7e3e154df003f016914ce0b08d87428ae476f' 
  AND token = '1cV/q4PX1bqVG3M+92OqWWsGozH1t2rYq+k38+loXsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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