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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d3c6c5ca5193d06444f1dde46e030964d63b21cb885abc6163e58131f8afd84' 
  AND token = 'qwMAycwhmLNY8VmIfceEaWXzevOyxh4Ljleuw+NR06o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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