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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab651b19b1574d7a2ec78cee15d346acb4b70d9892d6d1671a2a11ed2733bef' 
  AND token = '87Jm7VBxgJxmzYprhT5YFWaMYES+HJQaeVsPMtGsBFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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