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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1796af93e9835ee5e789609aecb08a5bdb4c0a299025c1a32136b07f3c8aeacc' 
  AND token = 'TlkK/jqKkZ/TFJDYt5xxZj36Ruc4kn043tYJZ8c/Xns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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