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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6edc1e0abeae4e73faa1fd003c35ae9598ca7ed1c4d9ff3196e1142ac066f860' 
  AND token = 'p5tmtDCNHnoR/Rhzc6bEiYQjQVTkvCc5/lmRAu6K9J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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