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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70c8f56a963509f941fd639a03cf7deade6f32189dcca3f2a948d80a70eef47' 
  AND token = 'jeTbkXEmdjIWVKQLSmFJpYd1ol4EP2kMpIl+xF2kmws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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