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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f64979afc4e34def8da4f8f53ead4a6f176887b8d8437cd4760c1ecf55a4144' 
  AND token = 'n4HOeeol86cjKNH7qFafDqHtPdWv8hMmC0SEFUDrNEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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