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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '612d4433e82cdb5f1d81cfcf6951302b5f4a07bd540a5b2790074d667e76369e' 
  AND token = 'jcFunWGF8i7qQr/rj0+7zQCRrCaN2jR14RkUQtP0n4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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