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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6aa2c628f41ac268d6da402eac00de98219ad9b675e2b7f38afab01590a8763' 
  AND token = '5c8mpjNBgML+dIjuBSsB4XGr8ITP15lvZcC1f059Dnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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