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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e3096ed11ebf2fb426d83bfab5b5525866899975f8e786380ccdcb0a118dbc1' 
  AND token = '3EAdPUs1PtnFcTPoB1w12p9rUYJ8LSTdilPtmECB+ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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