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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d655ca9085746e6ed5429390b9b891d7ad84af23193494edac266c0d2207eff' 
  AND token = '1GuTN/7yt9K9W5Ufc5as0OorHG8Fl1oKjDD3YJHnIvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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