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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3e1b90df60b525f0cbdbcd11768c1963304ea9c2b6ae066bf2d1ad65ba86f3b' 
  AND token = 'BgRArxCdI+dJls4+3ikqVMyBmo/tn/Q4lU+S7vpcDJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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