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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '241eff7743958d13ff75eb2f6217913afcc0bb6ceb381cb6fa6846f75958e905' 
  AND token = 'PBWBbRAT+zqbydAiiZNgQASH1uZwiA7Bp0ZkBgIRoFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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