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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a1a1f303a1b19f311291e04ab74c0cab3963d58f99847261e1535795e61edf4' 
  AND token = 'MxQoNmheQSRk2Xmf25pkC8YBzaky8c+SJv/RltgpKfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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