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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc77a346e99eaf4a3aa705984afbf3c81aa63583e6812d176382a27e062fe484' 
  AND token = '2vu+vC2qPIWKxd97Dxaq4nXfbO/RmaaXrWawjaNxlRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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