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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cf0dacd583d0f24e51d68ed218eb4852988481af686492fd103250eea0a9783' 
  AND token = 'DV/AS695yxjczuurertL2oCGsDqEG4ngRV+qDVC/SPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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