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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c547216f5ee307bbe4cd1961b444914282586dab06958253deef0b313f6c789' 
  AND token = 'BBK4+W0uDE6zPQuDaVc4Fd9601Yn/KA5/lgxO8c2FSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00498

JSON explain

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