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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94be0acc77190559d81bb73e8bdd30778704c0a0a52bd7dd467c97ab44ba8f3c' 
  AND token = 'diWR/8OOz1I43GBYafT+jPnIWySjpznb3GRLYLFhT8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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