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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f3263df130d454e69766dda05323a8203fef85d6c0daf6c13327ba47e9f785c' 
  AND token = 'iFxFOFhYAntteTz58HfGYbJfaGqFl/9Y54EdBtveNlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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