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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e3f70a6147e918dce87c308eb4b8a362fee2c36d0746e73cef9bf84a73737a6' 
  AND token = 'n2VIE8jtirGVEGdMpYX0M0RtmEaVmU/9piBFqSAMLpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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