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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192baba18f1cc1e71a7ae2a001d7c16b1b127e64e6e44a0920b12b77cdcbb459' 
  AND token = 'imFBAU26DyOVBbY9AnlJgHEupNKtko9u3HyNbF4Ga8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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