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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd97e2629a46d367bb969c4a6c04357cb1e6cab67bd36cf21860fbde4e3ca4f' 
  AND token = 'FbQbwL2KAM8kBB9frUYWJKC5slcXIPs4xNRfC/lh2Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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