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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2939de2b25616f68088a46aa33b532450ea833d66cd8f3be94e17a93ca1b98c8' 
  AND token = 'T2MLmZIdtTpZioDYowrLA4oQNf54pE+XLU9YpvGZ/ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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