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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6343ba4bf340469f8476979c267f76a4bc58e707843688afa49693029b6b9f' 
  AND token = 'SffU4kg+YrpdsDH9WURPdbC/XgbV2+MtV8akX5yuWEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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