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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ef93bfca17a4857283a8fae8b4970b88c573098c32144fff8731e223b40d53' 
  AND token = 'SAEyubs6ZlQ+EbqKucELilRZQbSd+DeuTo4vdwqoFIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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