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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6110844c96a258b2ac8e7f509280cca7d731796496d02168de375ec839f1bd5f' 
  AND token = '71HEAFq3ASeGFVmM3+HBuZ9liSvHMqSNMd1yDAw7/xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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