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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95661eb6b352681520c48251fa666ff7cc0ec3e1069fd7f081211844cb325c44' 
  AND token = 'pFcj35KfOybWB1uibMCA5jPEJEm7hoBvvj2DZk0OLQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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