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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67c0f19ed2b7a4eb8b5c88765248c4eca7356cf52272ba27247e8d2d01d2d76e' 
  AND token = 'sHpAWlhKJeoV0YMSaKNZhBuDsd4HO4aknwiuw6jsAkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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