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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '167d2768cb1d1899f5700aeaec230283acb95b37d4b4e7f0d6b0c8aa21842944' 
  AND token = 'MTOig+a795FEoWfQzQnzrd3EtBVFEUKODglyb/S1GbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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