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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93af700bdaba369b8a0ab27022d04b91c5f0eee5935d4748d2ffb41c2f778046' 
  AND token = 'U9RY3cpRBPM6X3zJh1LcGOM5CQiybOFRArP+rkbMPVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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