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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1420840ce4611d42188ce6ded8c82fd1e993df65e309e0ebf84f8dc154addb14' 
  AND token = 'lfHZf/wHgoT6utW4U2Ri0/92ND38PnJVD2YBt8JVn4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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