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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0689d456288926c6a43a311f37907a54cfed9ee26dceda629e1c83688a05de' 
  AND token = 'RhOkEgd+tx8kDBKLwxBYmBl1owEaSMSAffuAm7iMNKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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