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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '051fc70d6aa64fdcce8a5f062e85bb34c8f1962881cf2ff69528324b6edb647d' 
  AND token = 'r3kIkSxeY3KjDB6/d1ItuVaay4eejgP54+SfNpWFHdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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