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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '691d231e097438b4b05af3e25b92aa3e4a7171d2d3771fde62f14ff889847a61' 
  AND token = 'ateeeTFtd++496wD9fautdSvS2Ii+2rsQI446taWgv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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